Start Date | Context | Status | Description |
---|---|---|---|
2025-07-11 | hst_1254.pmap | latest | Delivery of new STIS CCD bias and dark reference files for CCD data taken between June 11 and July 09, 2025. The files were generated from data taken in the same time frame under STIS calibration programs 17633 and 17630. |
2025-07-11 | hst_1253.pmap | archived | A new post-flash reference file, FLSHFILE, is being delivered because new post-flash calibration data was taken in Nov 2024 as part of proposal 17663. The raw darks were separated by EXPTIME and FLASHDUR and combined with ACSREJ to create short and long-flashed superdarks. These superdarks were differenced and scaled to create an intermediate data product that was then smoothed with a local median filter and renormalized to produce the final post-flash reference file. This reference file is to be used in the calibration of post-flashed ACS WFC data taken after July 01 2024. |
2025-07-10 | hst_1252.pmap | archived | These WFC3 UVIS superdarks will affect all UVIS data taken from May 27, 2025 to June 22, 2025. Currently, the automated calibration pipeline and CRDS have only WFC3 UVIS drk and dkc reference files with USEAFTER dates of up to May 23, 2025. The automated pipeline should now use these reference files to perform dark subtraction on any UVIS datasets obtained between the dates above, as they represent the most accurate picture of dark current and hot pixels for this time period. This new bad pixel table with USEAFTER of May 27, 2025 was generated using data taken from May 28, 2025, through June 24, 2025. Currently, the Calibration Reference Data System only has WFC3 UVIS bad pixel reference tables up to a USEAFTER date of May 4, 2025. The automated pipeline should now use this reference file as the bad pixel table on any UVIS datasets obtained from May 27, 2025, to present because it represents the most accurate measure of pixel stability at the time of the science observation. For more details regarding individual deliveries, please see the Context History section and select all contexts on the CRDS homepage. |
2025-07-10 | hst_1250.pmap | archived | Updating the STIS NUV-MAMA TDSTAB reference file to reflect the latest time-dependent sensitivity trends. We have removed the horizontal slope after 01-01-2024 and corresponding breakpoint. The 01-01-2022 breakpoint has been changed to 09-27-2021, and the slopes recalculated, based on an optimization routine from our new TDS code. This change will improve flux calibration by 1 - 2 percent between 1800 and 2100 angstroms for data taken after 01-01-2024. Updating STIS IMPHTTAB reference file using new MIRNUV, MIRFUV, and MIRVIS throughputs. These throughputs were generated based on new TDSTABs that have been delivered for the FUV-MAMA, NUV-MAMA, and CCD. Affected data is STIS imaging data taken after 09-27-2021 for the NUV-MAMA, after 01-24-2020 for the FUV-MAMA, and after 01-01-2022 for the CCD. |